IQRF is a technology for wireless packet-oriented communication via radio frequency (RF) in sub-GHz ISM bands. It is intended for general use where wireless connectivity is needed, either point-to-point or in complex networks, e.g. for telemetry, industrial control, automation of buildings and cities and Internet of Things. Fully open functionality depends solely on a user-specific application. Basic IQRF communication device is a transceiver module (TR) including MCU with built-in operating system (OS) implementing link layer and network layer supporting Mesh networking utilizing IQMESH protocol. The application software can be written directly under OS in C language. Unlike the solution stack used, e.g. by ZigBee, only the application program is compiled while in development.